Restriction subs for setting cement plugs in wells
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United States of America Patent
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-
Mar 13, 1990
Issued Date -
N/A
app pub date -
Oct 26, 1988
filing date -
May 15, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In accordance with illustrative embodiments of the present invention, restriction subs for use in setting cement plugs in wells include a tubular threaded adapter having an internal annular recess, and a metal restriction sleeve mount in such recess. In one embodiment, the sleeve has a corrugation that extends into the bore of the adapter to provide a deformable restriction; in another embodiment the sleeve has curved resilient tabs whose free ends extend into such bore. The restrictions are cooperable with a displacement plug having a metal expander member on its nose so that a distinct pressure is required to cause the expander member and plug to be forced through the restriction.
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